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The authors used a calibration curve covering a range of 100. In order to demonstrate sufficient linearity I would strongly recommend that the response factor (response divided by concentration) is plotted against the concentration. The system is linear, if the response factors calculated at the various concentration form a line parallel to the x-axis. In addition I am concerned that due to the large range that establishes the calibration curve, measurements at low concentration are getting rather imprecise.

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